Search Publications
GRB 980425 host: [C II], [O I], and CO lines reveal recent enhancement of star formation due to atomic gas inflow
Le Floc'h, E.; Sollerman, J.; Hunt, L. K. +18 more
Context. Accretion of gas from the intergalactic medium is required to fuel star formation in galaxies. We have recently suggested that this process can be studied using host galaxies of gamma-ray bursts (GRBs).
Aims: Our aim is to test this possibility by studying in detail the properties of gas in the closest galaxy hosting a GRB (980425). …
Herschel detects oxygen in the β Pictoris debris disk
Heras, A. M.; Walker, H. J.; Ivison, R. J. +28 more
The young star β Pictoris is well known for its dusty debris disk produced through collisional grinding of planetesimals, kilometre-sized bodies in orbit around the star. In addition to dust, small amounts of gas are also known to orbit the star; this gas is likely the result of vaporisation of violently colliding dust grains. The disk is seen edg…
ALMA-resolved salt emission traces the chemical footprint and inner wind morphology of VY Canis Majoris
Smith, N.; Decin, L.; Richards, A. M. S. +6 more
Context. At the end of their lives, most stars lose a significant amount of mass through a stellar wind. The specific physical and chemical circumstances that lead to the onset of the stellar wind for cool luminous stars are not yet understood. Complex geometrical morphologies in the circumstellar envelopes prove that various dynamical and chemica…
Oxygen, neon, and iron X-ray absorption in the local interstellar medium
García, Javier A.; Kallman, Timothy R.; Gatuzz, Efraín +1 more
Aims: We present a detailed study of X-ray absorption in the local interstellar medium by analyzing the X-ray spectra of 24 galactic sources obtained with the Chandra High Energy Transmission Grating Spectrometer and the XMM-Newton Reflection Grating Spectrometer.
Methods: By modeling the continuum with a simple broken power-law and by i…
CLASH-VLT: Strangulation of cluster galaxies in MACS J0416.1-2403 as seen from their chemical enrichment
Grillo, C.; Balestra, I.; Rosati, P. +9 more
Aims: Environmental effects gain importance as large scale structures in the Universe develop with time and have become the dominant mechanism for quenching galaxies of intermediate and low stellar masses at lower redshifts. Therefore, clusters of galaxies at z< 0.5 are the sites where environmental effects are expected to be more pronounc…
Water in star-forming regions with Herschel (WISH). VI. Constraints on UV and X-ray irradiation from a survey of hydrides in low- to high-mass young stellar objects
Liseau, R.; van Dishoeck, E. F.; Lis, D. C. +18 more
Context. Hydrides are simple compounds containing one or a few hydrogen atoms bonded to a heavier atom. They are fundamental precursor molecules in cosmic chemistry and many hydride ions have become observable in high quality for the first time thanks to the Herschel Space Observatory. Ionized hydrides such as CH+ and OH+ (an…
Asteroseismic versus Gaia distances: A first comparison
De Ridder, J.; Eyer, L.; Aerts, C. +1 more
Context. The Kepler space mission led to a large number of high-precision time series of solar-like oscillators. Using a Bayesian analysis that combines asteroseismic techniques and additional ground-based observations, the mass, radius, luminosity, and distance of these stars can be estimated with good precision. This has given a new impetus to t…
Planck intermediate results. XLI. A map of lensing-induced B-modes
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +178 more
The secondary cosmic microwave background (CMB) B-modes stem from the post-decoupling distortion of the polarization E-modes due to the gravitational lensing effect of large-scale structures. These lensing-induced B-modes constitute both a valuable probe of the dark matter distribution and an important contaminant for the extraction of the primary…
NuSTAR reveals the extreme properties of the super-Eddington accreting supermassive black hole in PG 1247+267
Harrison, F. A.; Stern, D.; Zhang, W. W. +26 more
PG1247+267 is one of the most luminous known quasars at z ~ 2 and is a strongly super-Eddington accreting supermassive black hole (SMBH) candidate. We obtained NuSTAR data of this intriguing source in December 2014 with the aim of studying its high-energy emission, leveraging the broad band covered by the new NuSTAR and the archival XMM-Newton dat…
Gaia Data Release 1. On-orbit performance of the Gaia CCDs at L2
Prusti, T.; Mora, A.; Brown, A. G. A. +19 more
The European Space Agency's Gaia satellite was launched into orbit around L2 in December 2013 with a payload containing 106 large-format scientific CCDs. The primary goal of the mission is to repeatedly obtain high-precision astrometric and photometric measurements of one thousand million stars over the course of five years. The scientific value o…